There should be a certain amount of tact involved, and I agree if I were the customer I'd feel better seeing it in writing on the repair order in case something goes wrong/situation goes from bad to worse. Something the tech should put on there would read: "Contacted Zone Tech Representative, rep requests owner tries using mid-grade fuel instead of Premium fuel as a test to see if situation improves, other zone offices reporting improvement in driveability by switching to mid grade fuel".

Gilly

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wow, interesting, but what about heavy load conditions. for example, long steep hills, mountains, and 100+mph driving? i would imagine that 89 octane fuel would not be appropriate under these conditions.

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Jonathan
1998 S600
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